<template>
  <ul class="todo-main" @mouseleave="mouseIndex = -1">
    <li
      v-for="(item, index) in todoList"
      :key="item.id"
      :class="{ active: index === mouseIndex }"
      @mouseenter="mouseIndex = index"
    >
      <label>
        <input
          type="checkbox"
          :checked="item.done"
          @change="emit('singleChecked', index)"
        />
        <span>{{ item.thing }}</span>
      </label>
      <button class="btn btn-danger" @click="emit('singleDelete', index)">
        删除
      </button>
    </li>
    <!-- {{
      todoList
    }} -->
  </ul>
</template>
<script lang="ts">
import { defineComponent, onMounted, ref } from 'vue';

export default defineComponent({
  name: 'Content',
});
</script>

<script setup lang="ts">
// 引入
import type { todoListType } from '../../App';

// 接收props---todoList
const props = defineProps<{
  todoList: todoListType;
}>();

// 接收自定义事件
// defineEmits返回一个对象emit对象，供我们使用
const emit = defineEmits<{
  // 小括号中的event固定写法主要为了说明自定义事件的名称，其他都是这个事件函数的形参，冒号后面就是当前函数的返回值类型，自定义事件函数是没有返回值的，固定为void
  (event: 'singleChecked', index: number): void;
  (event: 'singleDelete', index: number): void;
}>();

// 挂载完成事件
onMounted(() => {
  console.log(props.todoList);
});

// 设置一个保存鼠标所在列表的下标
const mouseIndex = ref(-1);
</script>

<style scoped lang="scss">
/*main*/
.todo-main {
  margin-left: 0px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 0px;
}

.todo-empty {
  height: 40px;
  line-height: 40px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding-left: 5px;
  margin-top: 10px;
}
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  transition: 0.5s;
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}

.active {
  background-color: orange;
  transition: 0.5s;
  // color: white;
  font-weight: bold;
  button {
    display: block;
  }
}
</style>
